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In the Utilities screen there is the function that enables and disables as well as controls the polarity of the pedals. This is SEPARATE from the registration settings. The settings are in the "Controller" tab of the "Utility" menus.

The first thing to determine is if in the piano mode that the unit first comes up in do you get this problem. If you do not, the UNIT is likely OK electronically. If you DO get the problem as a plain piano at start up, then one or more disconnect diodes (small 1N4148) are probably shorted. This is VERY uncommon occurence. These diodes are on the contact boards of the keys themselves. Contamination of metal such as a paper clip or metal shard could cause the same thing.

The Tyros II has MANY features and a lot of these create layers that fire other notes when using styles as part of the stylle rhythm.

The keyboard split features that allow the keyboard to act as three seperate ones can lead one to think there is a problem.

I have two Tyros I and one Tyros II and have worked on all of them as they were purchased as damaged and non-functioning. I have schematics on CD and those are available from Yamaha America parts dept in California. They are copyrighted but they will sell you the CD with schematics, etc. for about $15.

I can help you troubleshoot the problem if it really is a problem. The first thing is to see if problem exists in the piano mode at startup. If it does, then try each note in combination to establish a pattern. If a disconnect diode is shorted, you will find certain notes interact. You need to find which are OK and which causes problems... Defining the keys as problems in chords does not help as we need key numbers such as C3 or F#4. Do the searches ONLY using two keys at a time as a matrix problem cannot be diagnosed doing three at a time or more.

You could record short "samples" to be used in building new voices, however, it does NOT appear that you can record a vocal song with the PSR9000. The Tyros II and III have the capability to record vocals but the PSR9000 and Tyros I do not..

When playing back an arrangement, you can re-sing the song and have the vocal harmonizer track the arrangement.

Try to pull it on pitch with the wheel... IF YOU CAN, then the alignment of the detent of the wheel has been disturbed and unit will need servicing... There are a lot of screws to open this and several very tender cables that can be damaged... I would recommend you take it to a shop experienced on this keyboard.

If somehow the registration is being bumped up or down during playing that would do it. VERIFY all the settings for the external pedal inputs regarding levels and function. Some of these can be set to do more than one thing. As a result, a pedal connected to the three jacks MIGHT be used for sustain and also triggering a step in registration number that is unwanted.

One needs to analyze the state of the unit when this happens...this should be possible UNLESS the whole thing including the data entry and display is freezing.

With the thousands of internal settings that are possible, it will be hard for us to give a definitive answer.

If you can afford to lose user created stuff, do a complete factory reset of the unit.

Storing is easy... editing is NOT so easy and is better done using a PC with an editing program.

Not knowing which model Tyros you have, either bring the MIDI files on floppy disk or USB stick.

Select the floppy or the USB source on the Tyros while in the song mode. Find and COPY a file or files, then move back to the place you want to store them like hardrive or user space and PASTE. You can create folders before each to keep the things seperate.